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Notes Payable (Details) (USD $)
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3 Months Ended |
0 Months Ended |
3 Months Ended |
0 Months Ended |
12 Months Ended |
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Mar. 31, 2014
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Oct. 15, 2013
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Mar. 31, 2015
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Sep. 19, 2014
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Mar. 14, 2014
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Dec. 19, 2013
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Jun. 24, 2013
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Dec. 31, 2013
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Oct. 23, 2013
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| Debt Instrument [Line Items] |
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| Proceeds from Issuance of Debt |
$ 1,500,000us-gaap_ProceedsFromIssuanceOfDebt
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| Sweetwater IDR Bond [Member] |
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| Debt Instrument [Line Items] |
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| Proceeds from Issuance of Long-term Debt |
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34,000,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= urg_SweetwaterIdrBondMember
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| Debt Instrument, Periodic Payment, Principal |
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31,996,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_DebtInstrumentAxis
= urg_SweetwaterIdrBondMember
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| RMBAH First Loan Facility [Member] |
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| Debt Instrument [Line Items] |
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| Fixed interest rate (as a percent) |
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8.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= urg_RmbahFirstLoanFacilityMember
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| Proceeds from Issuance of Debt |
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1,500,000us-gaap_ProceedsFromIssuanceOfDebt
/ us-gaap_DebtInstrumentAxis
= urg_RmbahFirstLoanFacilityMember
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5,000,000us-gaap_ProceedsFromIssuanceOfDebt
/ us-gaap_DebtInstrumentAxis
= urg_RmbahFirstLoanFacilityMember
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20,000,000us-gaap_ProceedsFromIssuanceOfDebt
/ us-gaap_DebtInstrumentAxis
= urg_RmbahFirstLoanFacilityMember
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| Repayments of Debt |
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20,000,000us-gaap_RepaymentsOfDebt
/ us-gaap_DebtInstrumentAxis
= urg_RmbahFirstLoanFacilityMember
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| Line of Credit Facility, Remaining Borrowing Capacity |
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3,500,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= urg_RmbahFirstLoanFacilityMember
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| Proceeds from Lines of Credit |
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3,500,000us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= urg_RmbahFirstLoanFacilityMember
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| Debt Instrument, Periodic Payment, Principal |
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6,750,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_DebtInstrumentAxis
= urg_RmbahFirstLoanFacilityMember
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| Maximum Borrowing Capacity |
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10,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= urg_RmbahFirstLoanFacilityMember
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| Due Quarterly Commencing From January One Two Thousand Fourteen [Member] | Sweetwater IDR Bond [Member] |
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| Debt Instrument [Line Items] |
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| Fixed interest rate (as a percent) |
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5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= urg_SweetwaterIdrBondMember
/ urg_QuarterlyPaymentsAxis
= urg_DueQuarterlyCommencingFromJanuaryOneTwoThousandFourteenMember
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| Due Quarterly Commencing From January One Two Thousand Fifteen [Member] | Sweetwater IDR Bond [Member] |
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| Debt Instrument [Line Items] |
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| Number of quarterly installments |
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28urg_DebtInstrumentNumberOfInstallments
/ us-gaap_DebtInstrumentAxis
= urg_SweetwaterIdrBondMember
/ urg_QuarterlyPaymentsAxis
= urg_DueQuarterlyCommencingFromJanuaryOneTwoThousandFifteenMember
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| Due Quarterly Commencing From June Thirty Two Thousand Fourteen [Member] | RMBAH First Loan Facility [Member] |
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| Debt Instrument [Line Items] |
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| Debt Instrument, Periodic Payment, Principal |
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$ 810,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_DebtInstrumentAxis
= urg_RmbahFirstLoanFacilityMember
/ urg_QuarterlyPaymentsAxis
= urg_DueQuarterlyCommencingFromJuneThirtyTwoThousandFourteenMember
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